Dialog with scroll bar and elements

See more:

C++

MFC

I have a scrollBar with elements like buttons, combo..I would like that my dialog has a scrollbar..because I have many elements and they don't enter in my dialog..How Can I do?

<pre>
<pre>void CModalitaNotturnaDlg2::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
	switch (nSBCode)
	{
	case SB_TOP:
		m_iSrcY = 0;
		break;
	case SB_BOTTOM:
		m_iSrcY = INT_MAX;
		break;
	case SB_THUMBPOSITION:
	case SB_THUMBTRACK:
		m_iSrcY = nPos;
		break;

	case SB_PAGEDOWN:
	case SB_LINEDOWN:
		if (m_iSrcY >= INT_MAX)
		{
			m_iSrcY = INT_MAX;
			return;
		}
		m_iSrcY += 10;
		break;
	case SB_PAGEUP:
	case SB_LINEUP:
		if (m_iSrcY <= (-INT_MAX))
		{
			m_iSrcY = 0;
			return;
		}
		m_iSrcY -= 10;
		break;
	}
	m_Scroll.SetScrollPos(m_iSrcY);
	Invalidate();
	CDialogEx::OnVScroll(nSBCode, nPos, pScrollBar);
}

<pre>
void CModalitaNotturnaDlg2::OnSize(UINT nType, int cx, int cy)
{

	//if (m_Scroll.GetSafeHwnd())
	//{
	vert.fMask = SIF_ALL;
	vert.nMin = 0;
	vert.nMax = 200;
	vert.nPage = 0;
	vert.nTrackPos = 0;
	m_Scroll.SetScrollInfo(&vert);

}

What I have tried:

I added some code but dialog doesn't change size..I don't know how I can show dialog